///*
// * Copyright 1999-2018 Alibaba Group Holding Ltd.
// *
// * Licensed under the Apache License, Version 2.0 (the "License");
// * you may not use this file except in compliance with the License.
// * You may obtain a copy of the License at
// *
// *      http://www.apache.org/licenses/LICENSE-2.0
// *
// * Unless required by applicable law or agreed to in writing, software
// * distributed under the License is distributed on an "AS IS" BASIS,
// * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// * See the License for the specific language governing permissions and
// * limitations under the License.
// */
//package com.alibaba.csp.sentinel.dashboard.controller;
//
//import com.alibaba.csp.sentinel.dashboard.auth.AuthAction;
//import com.alibaba.csp.sentinel.dashboard.auth.AuthService.PrivilegeType;
//import com.alibaba.csp.sentinel.dashboard.client.CommandNotFoundException;
//import com.alibaba.csp.sentinel.dashboard.client.SentinelApiClient;
//import com.alibaba.csp.sentinel.dashboard.datasource.entity.SentinelVersion;
//import com.alibaba.csp.sentinel.dashboard.datasource.entity.rule.ParamFlowRuleEntity;
//import com.alibaba.csp.sentinel.dashboard.discovery.AppManagement;
//import com.alibaba.csp.sentinel.dashboard.discovery.MachineInfo;
//import com.alibaba.csp.sentinel.dashboard.domain.Result;
//import com.alibaba.csp.sentinel.dashboard.repository.rule.RuleRepository;
//import com.alibaba.csp.sentinel.dashboard.util.VersionUtils;
//import com.alibaba.csp.sentinel.slots.block.RuleConstant;
//import com.alibaba.csp.sentinel.util.StringUtil;
//import org.slf4j.Logger;
//import org.slf4j.LoggerFactory;
//import org.springframework.beans.factory.annotation.Autowired;
//import org.springframework.web.bind.annotation.*;
//
//import java.util.Date;
//import java.util.List;
//import java.util.Optional;
//import java.util.concurrent.CompletableFuture;
//import java.util.concurrent.ExecutionException;
//
///**
// * @author Eric Zhao
// * @since 0.2.1
// */
//@RestController
//@RequestMapping(value = "/paramFlow")
//public class ParamFlowRuleControllerBack {
//
//    private final Logger logger = LoggerFactory.getLogger(ParamFlowRuleControllerBack.class);
//
//    @Autowired
//    private SentinelApiClient sentinelApiClient;
//    @Autowired
//    private AppManagement appManagement;
//    @Autowired
//    private RuleRepository<ParamFlowRuleEntity, Long> repository;
//
//    private boolean checkIfSupported(String app, String ip, int port) {
//        try {
//            return Optional.ofNullable(appManagement.getDetailApp(app))
//                .flatMap(e -> e.getMachine(ip, port))
//                .flatMap(m -> VersionUtils.parseVersion(m.getVersion())
//                    .map(v -> v.greaterOrEqual(version020)))
//                .orElse(true);
//            // If error occurred or cannot retrieve machine info, return true.
//        } catch (Exception ex) {
//            return true;
//        }
//    }
//
//    @GetMapping("/rules")
//    @AuthAction(PrivilegeType.READ_RULE)
//    public Result<List<ParamFlowRuleEntity>> apiQueryAllRulesForMachine(@RequestParam String app,
//                                                                        @RequestParam String ip,
//                                                                        @RequestParam Integer port) {
//        if (StringUtil.isEmpty(app)) {
//            return Result.ofFail(-1, "app cannot be null or empty");
//        }
//        if (StringUtil.isEmpty(ip)) {
//            return Result.ofFail(-1, "ip cannot be null or empty");
//        }
//        if (port == null || port <= 0) {
//            return Result.ofFail(-1, "Invalid parameter: port");
//        }
//        if (!appManagement.isValidMachineOfApp(app, ip)) {
//            return Result.ofFail(-1, "given ip does not belong to given app");
//        }
//        if (!checkIfSupported(app, ip, port)) {
//            return unsupportedVersion();
//        }
//        try {
//            return sentinelApiClient.fetchParamFlowRulesOfMachine(app, ip, port)
//                .thenApply(repository::saveAll)
//                .thenApply(Result::ofSuccess)
//                .get();
//        } catch (ExecutionException ex) {
//            logger.error("Error when querying parameter flow rules", ex.getCause());
//            if (isNotSupported(ex.getCause())) {
//                return unsupportedVersion();
//            } else {
//                return Result.ofThrowable(-1, ex.getCause());
//            }
//        } catch (Throwable throwable) {
//            logger.error("Error when querying parameter flow rules", throwable);
//            return Result.ofFail(-1, throwable.getMessage());
//        }
//    }
//
//    private boolean isNotSupported(Throwable ex) {
//        return ex instanceof CommandNotFoundException;
//    }
//
//    @PostMapping("/rule")
//    @AuthAction(PrivilegeType.WRITE_RULE)
//    public Result<ParamFlowRuleEntity> apiAddParamFlowRule(@RequestBody ParamFlowRuleEntity entity) {
//        Result<ParamFlowRuleEntity> checkResult = checkEntityInternal(entity);
//        if (checkResult != null) {
//            return checkResult;
//        }
//        if (!checkIfSupported(entity.getApp(), entity.getIp(), entity.getPort())) {
//            return unsupportedVersion();
//        }
//        entity.setId(null);
//        entity.getRule().setResource(entity.getResource().trim());
//        Date date = new Date();
//        entity.setGmtCreate(date);
//        entity.setGmtModified(date);
//        try {
//            entity = repository.save(entity);
//            publishRules(entity.getApp(), entity.getIp(), entity.getPort()).get();
//            return Result.ofSuccess(entity);
//        } catch (ExecutionException ex) {
//            logger.error("Error when adding new parameter flow rules", ex.getCause());
//            if (isNotSupported(ex.getCause())) {
//                return unsupportedVersion();
//            } else {
//                return Result.ofThrowable(-1, ex.getCause());
//            }
//        } catch (Throwable throwable) {
//            logger.error("Error when adding new parameter flow rules", throwable);
//            return Result.ofFail(-1, throwable.getMessage());
//        }
//    }
//
//    private <R> Result<R> checkEntityInternal(ParamFlowRuleEntity entity) {
//        if (entity == null) {
//            return Result.ofFail(-1, "bad rule body");
//        }
//        if (StringUtil.isBlank(entity.getApp())) {
//            return Result.ofFail(-1, "app can't be null or empty");
//        }
//        if (StringUtil.isBlank(entity.getIp())) {
//            return Result.ofFail(-1, "ip can't be null or empty");
//        }
//        if (entity.getPort() == null || entity.getPort() <= 0) {
//            return Result.ofFail(-1, "port can't be null");
//        }
//        if (entity.getRule() == null) {
//            return Result.ofFail(-1, "rule can't be null");
//        }
//        if (StringUtil.isBlank(entity.getResource())) {
//            return Result.ofFail(-1, "resource name cannot be null or empty");
//        }
//        if (entity.getCount() < 0) {
//            return Result.ofFail(-1, "count should be valid");
//        }
//        if (entity.getGrade() != RuleConstant.FLOW_GRADE_QPS) {
//            return Result.ofFail(-1, "Unknown mode (blockGrade) for parameter flow control");
//        }
//        if (entity.getParamIdx() == null || entity.getParamIdx() < 0) {
//            return Result.ofFail(-1, "paramIdx should be valid");
//        }
//        if (entity.getDurationInSec() <= 0) {
//            return Result.ofFail(-1, "durationInSec should be valid");
//        }
//        if (entity.getControlBehavior() < 0) {
//            return Result.ofFail(-1, "controlBehavior should be valid");
//        }
//        return null;
//    }
//
//    @PutMapping("/rule/{id}")
//    @AuthAction(PrivilegeType.WRITE_RULE)
//    public Result<ParamFlowRuleEntity> apiUpdateParamFlowRule(@PathVariable("id") Long id,
//                                                              @RequestBody ParamFlowRuleEntity entity) {
//        if (id == null || id <= 0) {
//            return Result.ofFail(-1, "Invalid id");
//        }
//        ParamFlowRuleEntity oldEntity = repository.findById(id);
//        if (oldEntity == null) {
//            return Result.ofFail(-1, "id " + id + " does not exist");
//        }
//
//        Result<ParamFlowRuleEntity> checkResult = checkEntityInternal(entity);
//        if (checkResult != null) {
//            return checkResult;
//        }
//        if (!checkIfSupported(entity.getApp(), entity.getIp(), entity.getPort())) {
//            return unsupportedVersion();
//        }
//        entity.setId(id);
//        Date date = new Date();
//        entity.setGmtCreate(oldEntity.getGmtCreate());
//        entity.setGmtModified(date);
//        try {
//            entity = repository.save(entity);
//            publishRules(entity.getApp(), entity.getIp(), entity.getPort()).get();
//            return Result.ofSuccess(entity);
//        } catch (ExecutionException ex) {
//            logger.error("Error when updating parameter flow rules, id=" + id, ex.getCause());
//            if (isNotSupported(ex.getCause())) {
//                return unsupportedVersion();
//            } else {
//                return Result.ofThrowable(-1, ex.getCause());
//            }
//        } catch (Throwable throwable) {
//            logger.error("Error when updating parameter flow rules, id=" + id, throwable);
//            return Result.ofFail(-1, throwable.getMessage());
//        }
//    }
//
//    @DeleteMapping("/rule/{id}")
//    @AuthAction(PrivilegeType.DELETE_RULE)
//    public Result<Long> apiDeleteRule(@PathVariable("id") Long id) {
//        if (id == null) {
//            return Result.ofFail(-1, "id cannot be null");
//        }
//        ParamFlowRuleEntity oldEntity = repository.findById(id);
//        if (oldEntity == null) {
//            return Result.ofSuccess(null);
//        }
//
//        try {
//            repository.delete(id);
//            publishRules(oldEntity.getApp(), oldEntity.getIp(), oldEntity.getPort()).get();
//            return Result.ofSuccess(id);
//        } catch (ExecutionException ex) {
//            logger.error("Error when deleting parameter flow rules", ex.getCause());
//            if (isNotSupported(ex.getCause())) {
//                return unsupportedVersion();
//            } else {
//                return Result.ofThrowable(-1, ex.getCause());
//            }
//        } catch (Throwable throwable) {
//            logger.error("Error when deleting parameter flow rules", throwable);
//            return Result.ofFail(-1, throwable.getMessage());
//        }
//    }
//
//    private CompletableFuture<Void> publishRules(String app, String ip, Integer port) {
//        List<ParamFlowRuleEntity> rules = repository.findAllByMachine(MachineInfo.of(app, ip, port));
//        return sentinelApiClient.setParamFlowRuleOfMachine(app, ip, port, rules);
//    }
//
//    private <R> Result<R> unsupportedVersion() {
//        return Result.ofFail(4041,
//            "Sentinel client not supported for parameter flow control (unsupported version or dependency absent)");
//    }
//
//    private final SentinelVersion version020 = new SentinelVersion().setMinorVersion(2);
//}
